Tungsten electroless nickel plating

Tungsten is a refractory metal whose name means "heavy stone" that is difficult to work with but has some special qualities. These properties allow it to be used in a variety of applications, including many involving harsh conditions and high temperatures.

Tungsten was probably first used in China more than 350 years ago, using tungsten pigments to give porcelain a peachy red color. In 1779, Irish chemist Peter Woulfe began preliminary research on the material. As a result of this early research, the substance's original name was Wolfram, a term that some countries still use today. This is also why the chemical symbol of tungsten is W.

The name tungsten emerged in 1781, when Swedish chemist Karl Wilhelm Scheele isolated an acidic white oxide while continuing to study the substance. Researchers Juan and Fausto Elhuyar are often credited with discovering tungsten. In 1783, their work led them to isolate metal oxides from wolframite. They then went a step further than other researchers and reduced the material to tungsten metal through a process of heating with carbon.

Tungsten did not become widely used until the 1840s. During this time, researcher Robert Oxland patented sodium tungstate and tungstic acid for industrial use. He later received another patent for an iron-tungsten alloy that is still in use today. Later, tungsten became an important material for making light bulb filaments.

Today, tungsten has a variety of uses in many industries, including manufacturing, electronics, automotive and aerospace. Various tungsten-containing alloys are now widely used.

Electroplating can help make it easier to use tungsten for various purposes. If you have the right methods and equipment, you can plate tungsten onto many different substances, as well as other materials onto tungsten alloys. There are also many coatings that are alloys of tungsten and other metals.

Nickel is the most suitable plating material for tungsten alloys. A qualified plating company can apply coatings to these materials using electroless nickel plating. Using tungsten as a base material for electroless nickel plating creates a product that is more useful than the element itself. At SPC, we have the expertise and equipment to perform this challenging plating operation.

Tungsten has many beneficial qualities that make it ideal for a variety of industrial uses. It shares many of the same properties as other refractory metals (molybdenum, tantalum, niobium and rhenium). These benefits include:

High melting point: Tungsten is known for its extremely high melting point, in fact, it is the highest of all metals. Its melting point is 6,100 degrees Fahrenheit or 3,370 degrees Celsius. Because of its ability to maintain strength at high temperatures, it is valuable for a variety of high-temperature applications.
High tensile strength: Tungsten also has extremely high tensile strength. Its ultimate tensile strength is 142,000 pounds of force per square inch (psi). Its tensile strength is 25,000 psi at 3,000 degrees Fahrenheit. It maintains this quality even when the diameter is small, such as when forming thin wires.
Density and Weight: Tungsten is also very dense, with a density of 0.697 pounds per cubic inch. It is also one of the heaviest metals. In fact, only rhenium, osmium and iridium are heavier. One cubic inch of tungsten weighs more than two-thirds of a pound.
Ductility: Despite its high density, weight, and strength, tungsten is very malleable. When formed into fine threads, it still retains its remarkable strength and other valuable qualities.
Corrosion and Acid Resistance: Tungsten is also highly resistant to corrosion, which makes it even more useful in harsh environments. It is resistant to atmospheric corrosion and various acids at room temperature. It's even resistant to liquid metals like mercury, hydrogen, sodium and magnesium.
Electrical Conductivity: Tungsten effectively conducts electricity and heat, making it useful in a variety of electronic applications.
Tungsten carbide is hard and wear-resistant: Tungsten is often alloyed with carbon to form tungsten carbide. This material has excellent hardness and wear resistance. Because of these properties, it is often an important material in the manufacture of cutting tools and industrial equipment.

Electroplating onto tungsten can enhance some of the material's properties, making it more useful. You can apply a variety of materials and processes for tungsten plating services.

You can plate tungsten using one of several processes, or you can electroplat tungsten. Electroplating tungsten is challenging, but with the right tools and skills, it's possible. Typically, tungsten alloys are used as the base material rather than pure tungsten. Electroplating onto a tungsten alloy such as tungsten carbide is easier than electroplating onto pure tungsten. Nickel is the coating that adheres best to tungsten.

Using the electroless nickel plating process on tungsten-based substrates offers several advantages. Electroless plating does not require an electric current like standard electroplating. It uses a specialized solution to clean the parts that will be plated. In this plating bath, a chemical reaction bonds the nickel to the substrate.

Electroless plating is a simpler and cleaner process than electroplating. It is also generally more cost-effective, allowing you to deposit coatings of more uniform thickness and even reach recessed portions of the substrate surface. The process also makes it easier to control coating thickness and avoids excess coating around corners and edges of workpieces. Because the plating is less porous, it also provides enhanced corrosion protection. You can also choose from gloss, semi-gloss or matte nickel finishes.

Applying a nickel coating to tungsten workpieces can enhance the corrosion and rust resistance of the workpiece.

Electroplating tungsten and tungsten alloys is not an easy task. This material is not easy to plate. If you can overcome these challenges and complete electroless nickel plating of a tungsten carbide substrate, the results can be very rewarding.

One of the main reasons why tungsten plating is difficult is that tungsten, like other refractory metals, is highly reactive. Tungsten maintains its strength and other useful properties at high temperatures. However, at these high temperatures it may form a volatile oxide film. Specifically, this happens when the temperature is above 538 degrees Fahrenheit. At high temperatures, tungsten may also react with carbon dioxide, carbon monoxide, nitrogen dioxide, and sulfur.

Creating a vacuum, using materials in a protected environment, or applying coatings to tungsten workpieces can all help prevent the formation of these oxide films. Electroless nickel plating is useful for tungsten materials because the outer layer can provide value in this way.

Before being electroplated onto tungsten, the parts must go through an associated cleaning process to improve adhesion. Although nickel coatings are one of the best materials for electroplating tungsten, the component should undergo an embrittlement elimination process after plating to ensure adequate coating adhesion.

These challenges have led manufacturers to electroplate tungsten alloys rather than pure tungsten. These alloys include tungsten carbide and molybdenum tungsten. You can also alloy nickel coatings with other metals, including tungsten, boron, tin and manganese, to achieve different results.

Before plating a tungsten workpiece, it must undergo a thorough cleaning process. This process is necessary for a variety of metals, but is especially important for tungsten due to its high reactivity and other associated challenges.

Typically, the process starts with pre-cleaning, followed by secondary cleaning and finally surface activation. The purpose of pre-cleaning is to loosen and remove most foreign matter that may be present on the surface. This usually involves soaking the material in a hot alkaline cleaning solution.

The first step in the tungsten pre-plating cleaning process is usually to soak the material in alkaline potassium ferrocyanide for one minute and then rinse.

Then boil it in 10% potassium hydroxide for 10 minutes, rinse, soak in 10% hydrochloric acid for 30 seconds, and rinse again.

You can then activate the material with a palladium chloride or Wood's Nickel rod before a final rinse. After completing these steps, you can proceed with plating.

Manufacturers often use tungsten and its alloys for applications requiring high temperature resistance, strength and wear resistance. Applying a nickel coating to these materials improves resistance to corrosion and rust.

Plating companies often use electroless nickel plating on alloyed tungsten carbide, which is an ideal material when extremely high hardness and wear resistance are required. Tungsten carbide is commonly used in the production of cutting, turning and milling tools for the petroleum, mining, metalworking, woodworking and other industries. It is used to make knives, drills, saws and other cutting tools.

Due to its electrical conductivity and heat resistance, tungsten is used in the production of various electronic components and devices, such as electrical contacts, semiconductors, and heat sinks. Adding nickel plating through the electroless nickel plating process improves corrosion resistance, makes the plating more uniform, and makes it easier to weld, solder, and braze the surface. Its heat resistance also makes it valuable in the manufacture of industrial equipment components, such as heating elements, radiation shields and evaporation boats.

Tungsten's heat resistance and nickel's corrosion resistance make it ideal for use in the harsh environments that automotive and aerospace components must withstand. These parts should also have excellent wear resistance since they must undergo frequent and sometimes high-speed movements. This is another beneficial quality of tungsten and its alloys. Tungsten also plays an important role in the production of heavy metal alloys such as high-speed steel, which is used to produce a variety of automotive parts.

Plating companies can also deposit alloys made of tungsten and nickel onto tungsten alloys and other materials. Nickel-phosphorus alloys are one of the most common electroplating alloys used in industrial applications. Recently, nickel-phosphorus-tungsten alloy has emerged as a promising industrial electroplating material. You can apply this material through electroless plating using plating baths of nickel, tungsten salts, and other substances. Phosphorus provides enhanced hardness and wear resistance, but adding even small amounts of tungsten can significantly improve these properties as well as corrosion resistance of the coating.

Nickel-tungsten alloys are also used in a variety of high-temperature applications. This alloy can be used as an alternative to hard chrome plating. Nickel-tungsten plating is harder and more wear-resistant than chrome plating. You can also apply multiple layers in one step, making the plating process more efficient and cost-effective.

Electroplating tungsten and tungsten-containing alloys is a challenging task that requires the right tools and experience. Only the most advanced metal finishing companies can reliably produce adequate nickel plating on tungsten alloy surfaces. When you need a uniform nickel coating on a tungsten-based substrate to increase strength, wear and corrosion resistance, and provide other benefits, you want to trust a professional plating company like Ehisen.